[eric] macos: native mouse-clamp addon to dodge the off-window mouse-release RootView::UpdateCursor crash

electron/scripts/build-mouseclamp.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+# Compile the macOS mouse-clamp native addon for one arch and stage it where
+# electron-builder's extraResources picks it up (build-staging/mouseclamp/<arch>).
+# See electron/native/mouseclamp/mouseclamp.mm for what it fixes.
+set -euo pipefail
+
+ARCH="${1:?usage: build-mouseclamp.sh <arm64|x64>}"
+ELECTRON_TARGET="42.0.0"
+
+HERE="$(cd "$(dirname "$0")/.." && pwd)"   # electron/
+SRC="$HERE/native/mouseclamp"
+OUT="$HERE/build-staging/mouseclamp/$ARCH"
+NODE_GYP="$HERE/node_modules/.bin/node-gyp"
+[[ -x "$NODE_GYP" ]] || NODE_GYP="npx --yes node-gyp"  # transitive dep usually, npx if not
+
+echo "[mouseclamp] building for arch=$ARCH (electron $ELECTRON_TARGET)"
+cd "$SRC"
+rm -rf build
+$NODE_GYP rebuild \
+  --target="$ELECTRON_TARGET" \
+  --arch="$ARCH" \
+  --dist-url=https://electronjs.org/headers
+
+mkdir -p "$OUT"
+cp "build/Release/mouseclamp.node" "$OUT/mouseclamp.node"
+echo "[mouseclamp] staged -> $OUT/mouseclamp.node"
+file "$OUT/mouseclamp.node"